1． As the world's population continues to grow, the ________ of food becomes more an d more of a concern.
A．worth B．supply
C ．package D．list
2． Whenever I made mistakes, the teacher pointed them out with ________.
A．curiosity B．satisfaction
C．envy D． patience
3． Currently, many American women are still faced with the ________ of choosing between work and family commitments.
A．desperation B．confusion
C．dilemma D．concern
4． Some students think they enjoy reading just out of interest, but others argue that a better score is their main ________.
A．recognition B．attraction
C．occupation D．motivation
5．—What does PM2.5 me an?
—It's a professional ________ indicating the condition of air pollution.
